java code for JSP and EL: EL Expression Examples

/*
Beginning JavaServer Pages
Vivek Chopra, Jon Eaves, Rupert Jones, Sing Li, John T. Bell
ISBN: 0-7645-7485-X

*/


<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="wroxtags" tagdir="/WEB-INF/tags" %>

EL Expression Examples

Arithmetic Operators in Expressions

There are ${1 + 2 * 4 - 6 / 2} apples on the table.

There are
${1 + 2 * 4 - 6 / 2}
apples on the table.



It feels like ${-4 - 8} degree today.



The average grade is ${(myGrade == 10) ? "perfect" : "good"}.

There are ${23/54} remaining.

There are ${6 div 2} apples on the table.

There are ${2003 div 8} apples on the table.

There are ${2003 mod 8} apples on the table.

There are ${2003 % 8} apples on the table.

Logical Operators

Your guess is ${guess}.



You're in range!



Try again!




Your guess is ${guess}.



You're in range!



Try again!

Comparison Operators

4 > '3' ${4 > '3'}

'4' > 3 ${'4' > 3}

'4' > '3' ${'4' > '3'}

4 >= 3 ${4 >= 3}

4 <= 3 ${4 < 3}

4 == '4' ${4 == 4}

empty Operator

empty "" ${empty ""}

empty "sometext" ${empty "sometext"}

empty Junk ${empty Junk}

empty guess ${empty guess}

Boolean and Null Values

equal!



null == null ${null == null}

"null" == null ${"null" == null}